Water filter



FIG. 1 is a perspective view of a water filter showing my design;

FIG. 2 is a side elevational view thereof, the other side views being a mirror image;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken line showing of letters, a numeral and an arrow in FIGS. 1 and 3 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a water filter, as shown and described. 